3.3 Consider the same vehicle and bridge structure of Example 3.2, except with the girder spans reduced to L=36 ft. Determine: a) the vehicle speed required to induce resonance in the vehicle spring system. b) The total amplitude of vertical motion ymax at resonance. c) The total amplitude of vertical motion ymax at the speed of 45 mph. Ĵ3² (1) k/2 W=4000 lb k/2 Speed == 45 mph 1.2 in ↓ Bridge surface L=40 ft 36 ft

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FEA for Dynamic Problems

Finite element analysis or FEA is a computational tool that evaluates the approximate solution for a particular engineering problem. The tools provided by FEA help to evaluate the solutions of partial differential equations (PDEs) computationally following a numerical approach. Solutions of the PDEs can also be performed by following traditional algebraic approaches, but when the problem gets towards the complex side, it becomes very tedious and almost impossible to arrive at the solutions. In such cases, the FEA fulfills the purpose by evaluating the equations following multiple time steps and iterations. The more the time steps and iterations, the more accurate the solution. The solution plotted by FEA analysis and mathematical approaches varies asymptotically.